Status Switch - IBM 5251 Series Maintenance Information Manual

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STATUS SWITCH
The Status switch on the control panel is a diagnostic
aid for the customer engineer. It also functions as a
reset switch and as a problem determination aid for the
operator.
If the switch is in the Test position when the display
station is powered on, the power-on diagnostic displays
the scan code for each key pressed. The power-on
diagnostic will continue to loop with the cursor in
position B until the switch is set to the Normal position.
The settings of the Address switches (Cable Thru
feature only) should not be changed while the power-on
diagnostic is looping unless a keyboard data key is
pressed and held down. Release the key to permit the
power-on diagnostic to loop after the settings of the
Address switches have been changed so that the
changes can be seen in the address field of the display
screen.
If the cursor is in position D and the Status switch is in
the Normal position, the clicker will sound only for the
first four keys pressed. Additional keys can be pressed,
but the clicker will not sound. If the Status switch is
now set to the Test position, lines 0 and 25 will be
displayed for approximately 5 seconds. During this 5
seconds, the hexadecimal code of the last key pressed
will be displayed in position 76 of line 25.
Cursor Display Positions
Lines 0 and 25 are displayed when the Status switch is
set to the Test position while a customer job is being
run or when the cursor is in position E. Display station
operation is not affected. Lines 0 and 25 are removed
when the Status switch is set to the Normal position.
You can reset the Storage Check light and Internal
Check light by setting the Status switch to the Test
position. The operator must sign on and restart the
customer job after the Status switch has been set to the
Normal position.
The field attribute will be displayed when the Status
switch is in the Test position.
Power-On Diagnostic Display
Status switch in the
Test position; keyboard
key pressed
A
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Maintenance Procedures 5251 MIM 1-105
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